Your pieces that fell out are how the bike disengages the auto clutch to shift, they'll go between the clutch and right side cover, you'll likely have to lay the bike on its side to stack them up for reassembly. Your clutches are inside the round aluminum drum on the end of the crankshaft. If you're gonna go that far into a bike you really ought to download or buy a service manual but you can get by pretty well looking at the exploded views on a site like Partzilla
Side cover breakdown
https://www.partzilla.com/catalog/ho...rankcase-cover
Clutch breakdown
https://www.partzilla.com/catalog/ho...tc110-a/clutch
Hoarder of the finest junk
'82 YT175
'83 YTM200
'85 KLT110
'86 Moto 4 225
'84 TRX200 trike conversion.
'87 Tecate 4
Lots of vintage and not so vintage two wheeled stuff.